99 lines
2.7 KiB
C#
99 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using FASTER.core;
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namespace MyFaster
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{
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public class LengRe
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{
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public void AAA()
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{
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// 创建存储设备（混合内存+磁盘）
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var logDevice = Devices.CreateLogDevice("colddata.log"); // 冷数据存储到磁盘
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var logSettings = new LogSettings
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{
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LogDevice = logDevice,
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MemorySizeBits = 20, // 1MB 内存（热数据区）
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PageSizeBits = 16 // 64KB 磁盘页
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};
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// 创建 FASTER 实例
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var store = new FasterKV<Key, Value>(
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size: 1 << 16, // 哈希表大小
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logSettings: logSettings
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);
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// 创建会话
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var session = store.NewSession(new SimpleFunctions<Key, Value>());
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// 写入数据（自动处理热/冷数据）
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Key key = new Key { Id = 1 };
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Value value = new Value { Data = "示例数据", LastAccessed = DateTime.UtcNow };
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session.Upsert(ref key, ref value);
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// 读取数据（热数据在内存，冷数据从磁盘加载）
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Value output = default;
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Status status = session.Read(ref key, ref output);
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Console.WriteLine($"读取数据: {output.Data}");
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Console.WriteLine($"最后访问: {output.LastAccessed}");
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// 更新访问时间（保持数据热度）
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output.LastAccessed = DateTime.UtcNow;
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session.Upsert(ref key, ref output);
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// 填充测试数据
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for (int i = 0; i < 1000; i++)
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{
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Key k = new Key { Id = i };
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Value v = new Value { Data = $"Item-{i}", LastAccessed = DateTime.UtcNow };
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session.Upsert(ref k, ref v);
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}
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// 访问部分数据保持热度
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for (int i = 0; i < 10; i++) // 频繁访问前10条
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{
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Key k = new Key { Id = i };
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Value v = default;
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session.Read(ref k, ref v);
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v.LastAccessed = DateTime.UtcNow;
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session.Upsert(ref k, ref v);
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}
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// 此时：
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// - 前10条是热数据（在内存）
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// - 其余990条是冷数据（在磁盘）
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}
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public void Read()
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{
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}
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}
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public struct Key : IEquatable<Key>
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{
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public int Id;
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public bool Equals(Key other) => Id == other.Id;
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}
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public struct Value
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{
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public string Data;
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public DateTime LastAccessed;
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}
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}
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